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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f8ffe4aa88c880c3114d7726fd8817e08d0794b4703fe41f211f8bf710b9704' 
  AND token = 'QET7VuGd7i8COOQbKuCBC1Zf8mk/pTqMTKLQEexuXrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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