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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f6f47341d55fc5c513f738d22e918762aa7f216c031e6a51f2221c1faa9c1c1' 
  AND token = 'KxtJzBybjEFeXGD4AVMbHntuzr1DMY85VklXFQVrQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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