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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5bcb539c4e2875a7aa2d7079cdbcda0e88c443fd0cda7558e7ee888ddf2bc28' 
  AND token = 'yQsln/n8EqLACY+rmDHyWdvVw4v3XnoSt7VZBBXnK+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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