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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0d3affc1d73e08de8248ecedf49ee3327c74a368e1e51b08f1d79d37a43a8ed' 
  AND token = 'ihQE+QoISUclDvQbS8D8RiZzdxogL5Sv1iP6selu05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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