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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1968788c28efa0c043c615b9857c1eb7f9088cd8072f2985a2b6d4e1d3e1940a' 
  AND token = 'UCpBl7co2QsGWQKQW2tuhR7zKnXDt0cwmkXQFzj/Nkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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