SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8003c5af527f7c14d72295e965180876cb73eb551d15b95ae67b6a87dff983cd' 
  AND token = 'PZ5iYGIaYTBGfs0BfscO/yuFmQE4BBYqHcREIuj6gt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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