SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '216951c8833fbe9a177691e9ae22bf4e9aa32e975b73e2ab0a0fd081df376c27' 
  AND token = '1QsYCbmaJzWifIKpWZJWrBS3yUX5w4LeI8ojkOuLX+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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