SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '060a3685b49545a073bcea59339f7a0e221dc78736bd827746a91924840f038b' 
  AND token = 'lnC3Y1l/++jbJaPE6e52lCNciqHViD+K5VkyHmi0WzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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