SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3145d6ddbf8fc60a552069af7858e2771ad69b14cf0c4a546959dcbc312b5704' 
  AND token = 'xNHj6PB0QR+VFx1aa0D8KUn14CqC6coYWC3oHs5ZClg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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