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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73027dc729adf1dfdc364e7cdc89468299c068fca562f0b7e39b6515ca0ed9a1' 
  AND token = '4dr55g5ZvM4eifY5w1bVMY9pPl+IP9896PY0J3nDAOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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