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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '185699992b3666074aa6bdd175f5a878b397afab83535a8cbf64cc5f393c0a76' 
  AND token = 'XTUxMaJ/Xys33qR8xqYLl//X7t7FC7KXw9LV/SeTLXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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