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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edaed0643b82ea6b68809d68da6cc3e9db34a678a7839c7f999c091e222cb15d' 
  AND token = 'epKfHS3t1nP2gP3E7Rc5H7ZMFXo4xlU3iGCPf5cLnzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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