SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f22a21b974e6bf5690ecb86ae34bd644bfa9b204db496d59c7723dc868f1c7e' 
  AND token = 'R5C/XBljsfGq4H1+pR1xhcdigLz5dSXDhlfz16t8Aqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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