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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7e357e2c3f205c6c63b97c729534fef9fe87ed699c3886649720837b3ea2a8' 
  AND token = 'Tw6x3SOe014hKGFV1pS6/1e048GyIiT9mulqAbPTfbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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