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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecba58458079274f74f5464c8a5ea0de16bf9490091881a9eb02c2ce9bf655d8' 
  AND token = '64Ip0C8M0JO9cr7L6FJAPj7J02pbSkK0Kl5+QgY3sTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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