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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd215c69bed055443969fb4c26b0ed6131d8e55a4dba042a7e81296b990378065' 
  AND token = 'jDeD+LrnqPKDDg1hD9j1Hjis0Wz1YBc23HoTa83kgOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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