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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '770472750d3827909b44bf44915b824f97c4b712c4e14abd48ac99aa89722f62' 
  AND token = '1842yaFjadl8uUAkg4HVt4dJHLzSYLph3I9SoL2jqy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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