SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caf926177c6c66e8a2025089d59ab111e8a7365671f643d98894c134bba71369' 
  AND token = 'XGMRCMwHaQ03Gz3YF3fB1wKIZZLmQlBw2l1NI8vv4vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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