SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d970fee718c14b58322f7695c2e497a949c08e12bf1637d93d006aa9429ae03' 
  AND token = 'CdqLvQjB/SbL6clZmlLjHA6+iHIzlANhZn+Rd5pOUCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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