SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3767e26fd4043c177be4fcf94cf252870104f19c8945fe90936dc314dbe105f' 
  AND token = 'j5QB/4acXCBognSr56gnbF8KNorm19zVT/xH628sNjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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