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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ff5fd09c5791c93419fb2f82eb4b92304beb30ffe752cc2fbb6ec7c90a04a36' 
  AND token = 'a259x46apjwek+N8P9aBNsr3/bamx6iSIBPn7Wpifjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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