SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb4884186a1bea8ca84712f9969d8ee9ba29849682129ac42260679a0144367b' 
  AND token = 'ieJQdnxuI3ts4jJBM7qgYzLBUvnom0BDgcDGy2F5U5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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