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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e1ba926b80b0b28b6eeabbbdf4a8be9dd9be3d50bcf09dd42be53e0162ccf3f' 
  AND token = 'RfJNyrBOgJk04jpLDmg5zIYHwDv3JG+M+owVTnUeDCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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