Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f3ee972cf7616620c92286f6ada29edaa0abc021b05737e90d624b022f52e3a' 
  AND token = 'MFCDPix1jeZmcHhb0nZmzBMVNfoQt6YF5aVTgAN+NTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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