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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba38b3442018140e4ab5631c9a8355415c3401dee8720342cc9b563e0c4ff087' 
  AND token = 'aDPEM2qpPpW5geExWJNnYUW7DlA/fmJoYqxdUTXK4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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