SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b433cf4cb5e6456f73cd5597c0fdc0cbb0b3398d491e85c324ef6e8bd7a66414' 
  AND token = 'FmXp9FZJwsRukQwR++ZRqXqSB7fTa1Ov6+btAKcf1MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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