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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bed18d9832ff118c3c0a92c0eefe69b5328cc60a13579afceed0ad13faf5fc22' 
  AND token = 'JUkMxDuqkyIPMn2pvbQ7iCTW1WbNHmfOk6/e7hoUz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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