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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d5fc6ccc776d8280c5ff42fb8ef4056781e6d51be57c1ba5a30b9c2585a1d4f' 
  AND token = 'AhrT0ruocpKclynoHKnRK7ijNzV+jQRqsatScDRfN28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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