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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ff8022cc2fb47c1c20a140c7d9abfd2bcd645988d232883d91afae5aedbd7d' 
  AND token = 'NnL7/vu1ye8vszivmGovzCty3SmVzWH+6dpIQJUe0Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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