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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45502d3ce394e4c743443ffed5d56207a5210ed7dccf149ef92850b5db81146c' 
  AND token = 'CT78aZN1XbazzvQvs6Ti3ryZBoJYrqkbrI6NpqCO7Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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