SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec76dd9b2f0f9370e5f9ab02e44f5cba57f0294b229a64866782375aa3aa42ee' 
  AND token = 'Yb1ZViYVgTIROgw73L3nBFE/Yk8wFG43t7PmajDyQzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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