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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a670cd8547d0d57cbd1898ec410d02c6a371a8ca3b2edf77ae85449835c30d48' 
  AND token = '+7MKi0XYmYsEluLNBYSlBnnX9ZnzgSmuHkmrc+MqDrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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