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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ad7a396fc242a1b4fa901a78bca7396ff606d9a55ed9c8aeef6d251f0d9b6e' 
  AND token = 'w97AIYw2zYyE33+e1sucXZ6ZE70nfWbCncYJ5GvuiSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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