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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6372b3bf31351cda28e3e5c77f9cf0cac094e53d3caf4eced83154925ee4132f' 
  AND token = '45AcC/QW8DQ4xNNQaokPPFM7HpZR/0RdYiQ2iKtTMaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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