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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e1760b88dce59d3b3224e6f62b7739b15400b5c30f5e938b5592005ea056e53' 
  AND token = 'CnK+A3wuRzPt4NxUeqYNmzN7eh2KpN4Z0Fs0Grd/20I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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