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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25f014082ee9fb1a02aafd6e028de28c7c41ed3e9037fcfbe17a442469891871' 
  AND token = 'i4P+YnL7lZqg5phssBE49J5STMBURFX+R8q4uylsLuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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