SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9925e5c9ea7509f5027678f33aa00c21a5bd41f67ec8374caf147560fd82541a' 
  AND token = 'z0+b4QchBzm45dZrKjnBgRKGu9vOfBglj+A91QKg87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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