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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d53a078d038e9ba45b07d75212d454b76fb676fdcb22c03a14fdd73a4eeba63' 
  AND token = '1ZalAe3RY4tkwDUe+noklgWkogYka6OTZJrx95a0dVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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