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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee4d584be0652d321ff0f2032ec132d4a4206b6fb1f55e03b89c76cb0a3ba832' 
  AND token = '7LQGxzboLFbS/5Dxh5VSAmqn9gLV1258ycmElUboc0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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