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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04f313317b55963b12a2b695e806daeb6212b6a540bb1eb99711c1dcb26a4c8f' 
  AND token = 'ZEzRPp2jvyKaYmr//7kcx7utaZN67hhxzFDrpNYMz18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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