SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ece8f90850b37bf71ae80120592302a8c6049b541847da669cd35a03b490578' 
  AND token = 'kJnoJoLXHaK1K+A2/cYGFqivEVBBdL7rdOAouwI8E6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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