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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dff1e579f2db0cc3a16a15744cc36614c559c1a7b51525a3902f999a7f22894c' 
  AND token = 'IScM5eNT/JmxWUgXLDMSpMEEgKTxMfw/62K7UKn0raE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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