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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb172a80fecbea4a82fa1fd67dd7ea5069a80e56095f5928c7ec58071daa9494' 
  AND token = 'hicc2GWAGUYXlJTbhYHsazs3sP0M7yAI3kia1xTYCtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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