SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0189c33ee0c30b7a2dd28ff8d73c52f2f4925ffd524b3ae09a67d960b9de8805' 
  AND token = 'DFYQvr2SKTVtg+BerSlmXdHtCBy/Gdxjh86N88oQmBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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