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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f74c3aa343ecd486d64521eeb0148dcdae1ce7fedc11645d22464dc14f0b5c4' 
  AND token = 'AcLiZ7DlFW7t2XWSbc22APFXoL4HUnQk9BPx8opjU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}