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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '053d7d016dbd1d656ebe007d87d99100d63d8ec3029ac75d52e700b81d6a4c7f' 
  AND token = '88BfhMepzJU6btdf8EoQyZE3LgrfCanlWuRiz0QsV9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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