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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '149d574640314eaade67c365a14000c61cd55b5b6a3a035782cbf8362a5a8e70' 
  AND token = 'tgkrA/ir04Sv8QhoUSmU0m3BW3DHUYM5jFlxQ29KkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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