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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f57666f21201e03c5722c12a02b0868f1869682c9ffb440f92af80f9559d8b4' 
  AND token = 'BkXhNiVNN+PDIk9NgT5b38S1cnV4zfH8HE+I1aTFpeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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