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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76f9bbefbf1faabff36f41f3731cdacd30a92ec6b4c110db347fedfd02121d6' 
  AND token = 'D4HE5L+h5UY5saxY8sZj1s4bNQHrPn454m00wlo034s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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