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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd39ebb1b23af4b68ae6c6739ae0898ccbd02fac2c3408a1e6951393fba349fb' 
  AND token = 'X6dYi0Vt8cGa0gAy5elZyRb/RBbpfeq5xLcLLKJ7WYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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