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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16e82ae4bed6e9fabd76c3ebd48fe0907ed19e0b19960e83cb7b6bcf21c19b33' 
  AND token = 'k6ZdvsouiU95zI7zuYSviGBAu26OQhEWpuGz5FJfIbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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