SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3963eace6124416118e3aff5f5aa9db7af8b8399475cd68a47a92200c3f067' 
  AND token = 'ETgeh/4xc3Yf6Q5zDBIX0JYAwDqC2n/ZPTlrQCRe2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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