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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad0f535f4db4e447a42c1301907e3f37542086a2a8e903039cd001e0661d2471' 
  AND token = 'dTgt2l2LQfCtCpZErRVZJ4iuTPBj0BpQ4qlFzbmKti8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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