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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fbcef6023b38465a3a06530b6ed13379df024efcbf5ccfa76cd6417440f1eb8' 
  AND token = '5Jriqg1mxnpeYm2889gspCX8ClhZYTcPvSusTC9CdaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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