SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54ce322cda77b6847f7ffb3bd841587dbdd6d564b0e283780231417975901ad3' 
  AND token = 'lVbL+jr2rgiFfjryqmZ3WIqOe4/UdByzKliFhwk+MpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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