SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a38c3f8e7d1ca0041f07acbe1f832200006223647345b98192172c2cdead59ad' 
  AND token = 'LYIaZL4xgMC+QIQrGYrZ4Llm3ABMhxuPfSW3TvcNMzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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