SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cab52affb15a8886790fac9318609101a32e379b3eae2395646e62dd9c5c493' 
  AND token = 'bwoFZm15edA2U7PHbD3GncYygQkUCW/yrnBOzq2ViU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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