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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '714fb97198b398c63270d0ad6bcea6ec6916d4e88c9c25c94db6162544210a8e' 
  AND token = 'uC/zuQcW+Ms7Nmfwh8d56370F3BfhQJxEslW0vWCSkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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