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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '552cbab30ce4aa200286230de359432a7b0e1d611099f688796f6643757222a7' 
  AND token = 'NQM8SyTQakppmLG/oHG2O4Tn/txtRrE4fT2RIsuq8A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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