SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0311ef622c69cdd0abf7dd35fdbb74c14278bcc24784a17d61bd64067ef80da9' 
  AND token = '1K+8gXLTWNnYQGVMbh5Kl6VB3DOk8SUKXUaeTyZH5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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