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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bdfee28c21d9e521163cbc747cf20d6229093821d6b16e675fc0624121468bd' 
  AND token = 'rvs4fCGNIVais978gzjplz/HssjvAgszAFbmn8A6MHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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