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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c19bd7ec3c4daf439340268dd0cfc5321fa28cfefcf5db84affb5c7b7fe0205f' 
  AND token = '2zt+PCfGtFaTFXVK/RwgyIoXF8/o3jOG2SeGC7o2f7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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