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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e907cf57c61be90ee94c295017048837e92d37288d6e5959bbc002dcb70a342' 
  AND token = 'LuTJryxcUSD8+ilm+69g2fggCNWEdboE6XmvQM23YFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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